Imaging optical lens assembly

ABSTRACT

An imaging optical lens assembly includes an aperture stop and an optical assembly, the optical assembly includes, in order from the object side to the image side: a first lens element with a positive refractive power; a second lens element with a refractive power; a third lens element with a refractive power; a fourth lens element with a refractive power; a fifth lens element with a negative refractive power having an image-side surface being convex near an optical axis; wherein the image-side surface of the fifth lens element is formed with at least two inflection points, including a first inflection point and a second inflection point further away from the optical axis, a vertical distance from the first inflection point to the optical axis is Y_inf1, a vertical distance from the second inflection point to the optical axis is Y_inf2, satisfying: 1.7&lt;Y_inf2/Y_inf1&lt;2.1.

CROSS REFERENCE TO RELATED APPLICATION

The present invention is a non-provisional of U.S. provisional application 61/903,563, the specification of which is hereby incorporated in its entirety by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an imaging optical lens assembly, and more particularly to a miniaturized imaging optical lens assembly applicable to electronic products.

2. Description of the Prior Art

In recent years, with the popularity of electronic devices having camera functionalities, the demand of miniaturized optical systems has been increasing. The sensor of a conventional optical system is typically a CCD (Charge-Coupled Device) or a CMOS (Complementary Metal-Oxide-Semiconductor) sensor. As the advanced semiconductor manufacturing technologies have allowed the pixel size of image sensors to be reduced and compact, optical systems have gradually evolved toward the field of higher megapixels, there is an increasing demand for compact optical systems featuring better image quality.

A conventional image taking lens system used in mobile phone usually consists of three lens elements: from the object side to the image side: a first lens element with a positive refractive power, a second lens element with a negative refractive power and a third lens element with a positive refractive power, thus forming the so-called type of Triplet, such as the image taking lens system described in U.S. Pat. No. 7,436,603. Although such an arrangement can correct most of the aberrations caused by the optical lens system, it requires a relatively long track length of the optical lens system, so the lens structure must be lengthened and it will be difficult to maintain the objective of miniaturization of the image taking lens system.

A developed image taking lens system consisting of four or five lens elements has better image quality, however, there's an increasing demand for image quality, and the need for miniaturization of the handheld mobile device has been close to the lens size limit to production. Therefore, under the condition that image quality and small size cannot be taken into account synchronously, the image quality of the image taking lens system or the production yield will be reduced.

The present invention been made in order to solve the above-mentioned problems.

SUMMARY OF THE INVENTION

The primary objective of the present invention is to provide an imaging optical lens assembly having high resolution, extra short track length and small distortion.

According to one aspect of the present invention, an imaging optical lens assembly comprises an aperture stop and an optical assembly, the optical assembly comprises, in order from the object side to the image side: a first lens element with a positive refractive power having an aspheric object-side surface and an aspheric image-side surface; a second lens element with a refractive power having an aspheric object-side surface and an aspheric image-side surface, the second lens element being made of plastic material; a third lens element with a refractive power having an aspheric object-side surface and an aspheric image-side surface, the third lens element being made of plastic material; a fourth lens element with a refractive power having an aspheric object-side surface and an aspheric image-side surface, the fourth lens element being made of plastic material; a fifth lens element with a negative refractive power having an aspheric object-side surface and an aspheric image-side surface being convex near the optical axis, the fifth lens element being made of plastic material.

Wherein the image-side surface of the fifth lens element is formed with at least two inflection points, including a first inflection point and a second inflection point further away from the optical axis, a vertical distance from the first inflection point to the optical axis is Y_inf1, a vertical distance from the second inflection point to the optical axis is Y_inf2, and the following condition is satisfied:

1.7<Y_inf2/Y_inf1<2.1.

If the fifth lens element satisfies the above condition, it will be favorable to improve the astigmatism and distortion, so as to obtain better image quality. It will also be favorable to adjust the incident angle of the light with respect to the image sensor that is disposed on the image plane, so as to improve the peripheral dark environment.

If Y_inf2/Y_inf1 satisfies the above condition, the astigmatism can be better controlled.

Preferably, the focal length of the imaging optical lens assembly is f, the radius of curvature of the image-side surface of the fifth lens element is R10, and the following condition is satisfied: −1.2<R10/f<−0.3, which can correct the aberrations and improve image quality, and will be favorable to maintain a certain back focal length for facilitating assembly.

Preferably, the distance along an optical axis between the second lens element and the third lens element is T23, the distance along the optical axis between the fourth lens element and the fifth lens element is T45, and the following condition is satisfied: 0.3<T23/T45<1.1, the adjustment of the distances will be favorable to reduce the total track length of the imaging optical lens assembly to the appropriate value.

Preferably, the Abbe number of the second lens element is V2, the Abbe number of the third lens element is V3, and the following condition is satisfied: 20<V3−V2<42, which will be favorable to correct the chromatic aberration of the imaging optical lens assembly.

Preferably, the aperture stop is located between the second lens element and an object to be photographed. Therefore, if the aperture stop is located between the first and second lens elements, the aperture stop is a center aperture, it is favorable to enlarge the field of view of the imaging optical lens assembly and thereby provides a wider field of view for the same. If the aperture stop is located between the object to be photographed and the first lens element, it can provide a longer distance between an exit pupil of the imaging optical lens assembly and the image plane and thereby improves the image-sensing efficiency of an image sensor.

Preferably, the radius of curvature of the object-side surface of the fifth lens element is R9, the radius of curvature of the image-side surface of the fifth lens element is R10, and the following condition is satisfied: 0.15<R9/R10<1.0, which can improve the refractive power of the lens elements and correct the aberrations.

Preferably, the focal length of the first lens element is f1, the focal length of the second lens element is f2, and the following condition is satisfied: −0.7<f1/f2<−0.3, suitable adjustment is favorable to reduce the sensitivity to tolerance and can better correct the aberrations.

Preferably, the maximal field of view of the imaging optical lens assembly is FOV, and the following condition is satisfied: 70≦FOV<85, which can obtain wider field of view and larger shooting range.

Preferably, the distance in parallel with the optical axis from an axial vertex on the image-side surface of the fourth lens element to a maximum effective radius position on the image-side surface of the fourth lens element is SAG_(—)42, the central thickness of the fourth lens element is CT4, and the following condition is satisfied: 1.0≦|SAG_(—)42|/CT4<1.8, which can improve the peripheral light gathering ability and maintain a certain edge thickness of the lens element, so as to reduce the forming difficulty.

Preferably, the focal length of the first lens element is f1, the focal length of the second lens element is f2, the focal length of the third lens element is f3, and the following condition is satisfied: |f3|>|f2|>f1, so that the refractive power of the second lens element will be more proper, it will be favorable to reduce the total track length of the imaging optical lens assembly.

Preferably, the distance from the object-side surface of the first lens element to the image plane along the optical axis is TTL, half of the maximum diagonal imaging height of the imaging optical lens assembly is ImgH, and the following condition is satisfied: TTL/ImgH<1.7, it can maintain the objective of miniaturization of the imaging optical lens assembly, so as to be used in light-weight portable electronic products.

According to another aspect of the present invention, an imaging optical lens assembly comprises an aperture stop and an optical assembly, the optical assembly comprises, in order from the object side to the image side: a first lens element with a positive refractive power having an aspheric object-side surface being convex near the optical axis and an aspheric image-side surface; a second lens element with a negative refractive power having an aspheric object-side surface and an aspheric image-side surface, the second lens element being made of plastic material; a third lens element with a refractive power having an aspheric object-side surface and an aspheric image-side surface, the third lens element being made of plastic material; a fourth lens element with a positive refractive power having an aspheric object-side surface and an aspheric image-side surface being convex near the optical axis, the fourth lens element being made of plastic material; a fifth lens element with a negative refractive power having an aspheric object-side surface being concave near the optical axis and an aspheric image-side surface being convex near the optical axis, the fifth lens element being made of plastic material; the aperture stop being located between the second lens element and an object to be photographed.

Wherein the focal length of the imaging optical lens assembly is f, the radius of curvature of the image-side surface of the fifth lens element is R10, the focal length of the first lens element is f1, the focal length of the second lens element is f2, the focal length of the third lens element is f3, and the following conditions are satisfied:

−1.2<R10/f<−0.3;

|f3|>|f2|>f1.

If R10/f satisfies the above condition, it can correct the aberrations and improve image quality, and will be favorable to maintain a certain back focal length for facilitating assembly.

If f1, f2 and f3 satisfy the above condition, the refractive power of the second lens element will be more proper, it will be favorable to reduce the total track length of the imaging optical lens assembly.

Preferably, the image-side surface of the fifth lens element is formed with at least two inflection points, it will be favorable to adjust the incident angle of the light with respect to the image sensor that is disposed on the image plane, so as to improve the peripheral dark environment. It will also be favorable to correct the astigmatism.

Preferably, the image-side surface of the fifth lens element is formed with a first inflection point and a second inflection point further away from the optical axis, a vertical distance from the first inflection point to the optical axis is Y_inf1, a vertical distance from the second inflection point to the optical axis is Y_inf2, and the following condition is satisfied: 1.7<Y_inf2/Y_inf1<2.1, so that the astigmatism can be better controlled.

Preferably, the focal length of the first lens element is f1, the focal length of the second lens element is f2, and the following condition is satisfied: −0.7<f1/f2<−0.3, suitable adjustment is favorable to reduce the sensitivity to tolerance and can better correct the aberrations.

Preferably, the radius of curvature of the object-side surface of the fifth lens element is R9, the radius of curvature of the image-side surface of the fifth lens element is R10, and the following condition is satisfied: 0.15<R9/R10<1.0, which can improve the refractive power of the lens elements and correct the aberrations.

Preferably, the distance in parallel with the optical axis from an axial vertex on the image-side surface of the fourth lens element to a maximum effective radius position on the image-side surface of the fourth lens element is SAG_(—)42, the central thickness of the fourth lens element is CT4, and the following condition is satisfied: 1.0≦|SAG_(—)42|/CT4<1.8, which can improve the peripheral light gathering ability and maintain a certain edge thickness of the lens element, so as to reduce the forming difficulty.

Preferably, the Abbe number of the second lens element is V2, the Abbe number of the third lens element is V3, and the following condition is satisfied: 20<V3−V2<42, which will be favorable to correct the chromatic aberration of the imaging optical lens assembly.

Preferably, the radius of curvature of the image-side surface of the second lens element is R4, the radius of curvature of the object-side surface of the third lens element is R5, and the following condition is satisfied: −35.0<(R4+R5)/(R4−R5)<−0.9, so that the angle of light between the second and third lens elements can be controlled to the appropriate value, so as to reduce the sensitivity to assembly of the imaging optical lens assembly.

Preferably, the distance from the object-side surface of the first lens element to the image plane along the optical axis is TTL, half of the maximum diagonal imaging height of the imaging optical lens assembly is ImgH, and the following condition is satisfied: TTL/ImgH<1.7, it can maintain the objective of miniaturization of the imaging optical lens assembly, so as to be used in light-weight portable electronic products.

The present invention will be presented in further details from the following descriptions with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiments in accordance with the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A shows an imaging optical lens assembly in accordance with a first embodiment of the present invention;

FIG. 1B shows the longitudinal spherical aberration curve, the astigmatic field curve and the distortion curve of the first embodiment of the present invention;

FIG. 2A shows an imaging optical lens assembly in accordance with a second embodiment of the present invention;

FIG. 2B shows the longitudinal spherical aberration curve, the astigmatic field curve and the distortion curve of the second embodiment of the present invention;

FIG. 3A shows an imaging optical lens assembly in accordance with a third embodiment of the present invention;

FIG. 3B shows the longitudinal spherical aberration curve, the astigmatic field curve and the distortion curve of the third embodiment of the present invention;

FIG. 4A shows an imaging optical lens assembly in accordance with a fourth embodiment of the present invention;

FIG. 4B shows the longitudinal spherical aberration curve, the astigmatic field curve and the distortion curve of the fourth embodiment of the present invention;

FIG. 5A shows an imaging optical lens assembly in accordance with a fifth embodiment of the present invention;

FIG. 5B shows the longitudinal spherical aberration curve, the astigmatic field curve and the distortion curve of the fifth embodiment of the present invention;

FIG. 6A shows an imaging optical lens assembly in accordance with a sixth embodiment of the present invention;

FIG. 6B shows the longitudinal spherical aberration curve, the astigmatic field curve and the distortion curve of the sixth embodiment of the present invention;

FIG. 7A shows an imaging optical lens assembly in accordance with a seventh embodiment of the present invention;

FIG. 7B shows the longitudinal spherical aberration curve, the astigmatic field curve and the distortion curve of the seventh embodiment of the present invention;

FIG. 8A shows an imaging optical lens assembly in accordance with an eighth embodiment of the present invention;

FIG. 8B shows the longitudinal spherical aberration curve, the astigmatic field curve and the distortion curve of the eighth embodiment of the present invention;

FIG. 9A shows an imaging optical lens assembly in accordance with a ninth embodiment of the present invention;

FIG. 9B shows the longitudinal spherical aberration curve, the astigmatic field curve and the distortion curve of the ninth embodiment of the present invention;

FIG. 10A shows an imaging optical lens assembly in accordance with a tenth embodiment of the present invention;

FIG. 10B shows the longitudinal spherical aberration curve, the astigmatic field curve and the distortion curve of the tenth embodiment of the present invention;

FIG. 11A shows an imaging optical lens assembly in accordance with an eleventh embodiment of the present invention;

FIG. 11B shows the longitudinal spherical aberration curve, the astigmatic field curve and the distortion curve of the eleventh embodiment of the present invention;

FIG. 12A shows an imaging optical lens assembly in accordance with a twelfth embodiment of the present invention;

FIG. 12B shows the longitudinal spherical aberration curve, the astigmatic field curve and the distortion curve of the twelfth embodiment of the present invention;

FIG. 13A shows an imaging optical lens assembly in accordance with a thirteenth embodiment of the present invention;

FIG. 13B shows the longitudinal spherical aberration curve, the astigmatic field curve and the distortion curve of the thirteenth embodiment of the present invention;

FIG. 14 shows distances Y_inf2 and Y_inf1 of the fifth lens element in FIG. 1A; and

FIG. 15 shows the distance SAG_(—)42 of the fourth lens element in FIG. 1A.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1A shows an imaging optical lens assembly in accordance with a first embodiment of the present invention, and FIG. 1B shows, in order from left to right, the longitudinal spherical aberration curves, the astigmatic field curves, and the distortion curve of the first embodiment of the present invention. An imaging optical lens assembly in accordance with the first embodiment of the present invention comprises an aperture stop 100 and an optical assembly. The optical assembly comprises, in order from an object side to an image side: a first lens element 110, a second lens element 120, a third lens element 130, a fourth lens element 140, a fifth lens element 150, an IR cut filter 160 and an image plane 170, wherein the imaging optical lens assembly has a total of five lens elements with refractive power. The aperture stop 100 is located between an object to be photographed and an image-side surface 112 of the first lens element 110.

The first lens element 110 with a positive refractive power has an object-side surface 111 being convex near an optical axis 190 and the image-side surface 112 being concave near the optical axis 190, both the object-side and image-side surfaces 111, 112 are aspheric, and the first lens element 110 is made of plastic material.

The second lens element 120 with a negative refractive power has an object-side surface 121 being convex near the optical axis 190 and an image-side surface 122 being convex near the optical axis 190, both the object-side and image-side surfaces 121, 122 are aspheric, and the second lens element 120 is made of plastic material.

The third lens element 130 with a positive refractive power has an object-side surface 131 being convex near the optical axis 190 and an image-side surface 132 being convex near the optical axis 190, both the object-side and image-side surfaces 131, 132 are aspheric, and the third lens element 130 is made of plastic material.

The fourth lens element 140 with a positive refractive power has an object-side surface 141 being concave near the optical axis 190 and an image-side surface 142 being convex near the optical axis 190, both the object-side and image-side surfaces 141, 142 are aspheric, and the fourth lens element 140 is made of plastic material.

The fifth lens element 150 with a negative refractive power has an object-side surface 151 being concave near the optical axis 190 and an image-side surface 152 being convex near the optical axis 190, both the object-side and image-side surfaces 151, 152 are aspheric, the fifth lens element 150 is made of plastic material, and more than two inflection points are formed on the image-side surface 152 of the fifth lens element 150.

The IR cut filter 160 made of glass is located between the fifth lens element 150 and the image plane 170 and has no influence on the focal length of the imaging optical lens assembly.

The equation for the aspheric surface profiles of the first embodiment is expressed as follows:

${z(h)} = {\frac{{ch}^{2}}{1 + \sqrt{1 - {\left( {1 + k} \right)c^{2}h^{2}}}} + {A_{4}h^{4}} + {A_{6}h^{6}} + {A_{8}h^{8}} + {A_{10}h^{10}} + {A_{12}h^{12}} + {A_{14}h^{14}} + \ldots}$

z represents the distance of a point on the aspheric surface at a height h from the optical axis 190 relative to a plane perpendicular to the optical axis at the vertex of the aspheric surface;

c is a paraxial curvature equal to 1/R (R: a paraxial radius of curvature);

h represents a vertical distance from the point on the curve of the aspheric surface to the optical axis 190;

k represents the conic constant;

A₄, A₆, A₈, A₁₀, A₁₂, A₁₄ . . . : represent the high-order aspheric coefficients.

In the first embodiment of the present imaging optical lens assembly, the focal length of the imaging optical lens assembly is f, the f-number of the imaging optical lens assembly is Fno, half of the maximal field of view of the imaging optical lens assembly is HFOV, and the following conditions are satisfied:

f=3.53 mm, Fno=2.4, and HFOV=38.6 degrees.

In the first embodiment of the present imaging optical lens assembly, the maximal field of view of the imaging optical lens assembly is FOV, and the following condition is satisfied:

FOV=77.2.

In the first embodiment of the present imaging optical lens assembly as shown in FIG. 14, the image-side surface 152 of the fifth lens element 150 is formed with a first inflection point P1 and a second inflection point P2 further away from the optical axis 190, a vertical distance from the first inflection point P1 to the optical axis 190 is Y_inf1, a vertical distance from the second inflection point P2 to the optical axis 190 is Y_inf2, and the following condition is satisfied:

Y_inf2/Y_inf1=1.87.

In the first embodiment of the present imaging optical lens assembly, the focal length of the imaging optical lens assembly is f, the radius of curvature of the image-side surface 152 of the fifth lens element 150 is R10, and the following condition is satisfied:

R10/f=−0.84.

In the first embodiment of the present imaging optical lens assembly, the distance along the optical axis 190 between the second lens element 120 and the third lens element 130 is T23, the distance along the optical axis 190 between the fourth lens element 140 and the fifth lens element 150 is T45, and the following condition is satisfied:

T23/T45=0.70.

In the first embodiment of the present imaging optical lens assembly, the Abbe number of the second lens element 120 is V2, the Abbe number of the third lens element 130 is V3, and the following condition is satisfied:

V3−V2=32.10.

In the first embodiment of the present imaging optical lens assembly, the radius of curvature of the object-side surface 151 of the fifth lens element 150 is R9, the radius of curvature of the image-side surface 152 of the fifth lens element 150 is R10, and the following condition is satisfied:

R9/R10=0.20.

In the first embodiment of the present imaging optical lens assembly, the focal length of the first lens element 110 is f1, the focal length of the second lens element 120 is f2, and the following condition is satisfied:

f1/f2=−0.56.

In the first embodiment of the present imaging optical lens assembly as shown in FIG. 15, the distance in parallel with the optical axis 190 from an axial vertex on the image-side surface 142 of the fourth lens element 140 to a maximum effective radius position on the image-side surface 142 of the fourth lens element 140 is SAG_(—)42, the central thickness of the fourth lens element 140 is CT4, and the following condition is satisfied:

|SAG _(—)42|/CT4=1.22.

In the first embodiment of the present imaging optical lens assembly, the focal length of the first lens element 110 is f1, the focal length of the second lens element 120 is f2, the focal length of the third lens element 130 is f3, and the following condition is satisfied:

|f3|>|f2|>f1.

In the first embodiment of the present imaging optical lens assembly, the radius of curvature of the image-side surface 122 of the second lens element 120 is R4, the radius of curvature of the object-side surface 131 of the third lens element 130 is R5, and the following condition is satisfied:

(R4+R5)/(R4−R5)=−1.65.

In the first embodiment of the present imaging optical lens assembly, the distance from the object-side surface 111 of the first lens element 110 to the image plane 170 along the optical axis 190 is TTL, half of the maximum diagonal imaging height of the imaging optical lens assembly is ImgH, and the following condition is satisfied:

TTL/ImgH=1.47.

The detailed optical data of the first embodiment is shown in Table 1, and the aspheric surface data is shown in Table 2.

TABLE 1 (Embodiment 1) Focal Surface Curvature Radius Thickness Material index Abbe # length 0 Object Plane Infinity 1 Aperture Plane −0.22 stop 2 Lens 1 1.3260(ASP) 0.52 Plastic 1.535 55.7 2.7126 3 12.6377(ASP) 0.063 4 Lens 2 46.6386(ASP) 0.28 Plastic 1.633 23.6 −4.8737 5 2.9210(ASP) 0.25 6 Lens 3 11.9495(ASP) 0.47 Plastic 1.535 55.7 12.0482 7 −13.9398(ASP) 0.44 8 Lens 4 −6.6553(ASP) 0.66 Plastic 1.546 55.9 1.9137 9 −0.9386(ASP) 0.36 10 Lens 5 −0.6008(ASP) 0.34 Plastic 1.535 55.7 −1.4756 11 −2.9715(ASP) 0.03 12 IR-filter Plane 0.21 Glass 1.517 64.0 13 Plane 0.55 14 Image Plane 0 f(focal length) = 3.53 mm, Fno = 2.4, HFOV = 38.6 deg.

TABLE 2 Aspheric Coefficients Surface # 2 3 4 5 6 k= −0.2607 −90.0000 −90.0000 −38.3992 34.5982 A4= 1.4179E−02 −1.5740E−01 −1.9806E−01 9.5207E−02 −2.2111E−01 A6= 2.9627E−02 3.7430E−01 6.0868E−01 2.0655E−01 −3.0442E−02 A8= −8.9556E−02 −5.4330E−01 −7.1249E−01 −2.7461E−01 4.1907E−01 A10= 1.4536E−01 3.1955E−01 1.3007E−01 4.4540E−01 −1.6554E+00 A12= −6.4816E−02 −6.1729E−01 −1.0057E−01 −4.9378E−01 2.3925E+00 A14= −1.6064E−01 4.3207E−01 2.8095E−01 3.9048E−01 −1.2427E+00 A16= 0 0 0 0 0 A18= 0 0 0 0 0 A20= 0 0 0 0 0 Surface # 7 8 9 10 11 k= −75.9940 20.5214 −0.9908 −2.1331 −90.0000 A4= −2.1737E−01 −2.6363E−01 1.4996E−02 2.7094E−01 1.7884E−01 A6= 5.8381E−02 1.8720E−02 9.0870E−02 −1.2761E−01 −1.5672E−01 A8= −1.2787E−01 1.9923E−01 −6.4562E−02 −8.9093E−02 5.7242E−02 A10= −2.8660E−02 −2.3583E−01 2.2434E−02 9.8498E−02 −9.4638E−03 A12= 1.4471E−01 −1.3420E−01 1.9169E−03 −5.3323E−03 2.1018E−05 A14= −5.2677E−02 3.6969E−01 −1.3966E−04 −2.7803E−02 1.7287E−04 A16= 0 −0.1562372 −0.00110534 1.2576E−02 −1.1584E−05 A18= 0 0 0 −0.001712 −5.24E−07 A20= 0 0 0 0 0

The units of the radius of curvature, the thickness and the focal length in table 1 are expressed in mm, in the tables 1 and 2, the surface numbers 0-14 represent the surfaces sequentially arranged from the object-side to the image-side along the optical axis, and in table 2, k represents the conic coefficient of the equation of the aspheric surface profiles, and A₄, A₆, A₈, A₁₀, A₁₂, A₁₄, A₁₆, A₁₈, A₂₀ . . . : represent the high-order aspheric coefficients arranging from the 4th order to the 20th order. The tables presented below for each embodiment are the corresponding schematic parameter and aberration curves, and the definitions of the tables are the same as Table 1 and Table 2 of the first embodiment. Therefore, an explanation in this regard will not be provided again.

FIG. 2A shows an imaging optical lens assembly in accordance with a second embodiment of the present invention, and FIG. 2B shows, in order from left to right, the longitudinal spherical aberration curves, the astigmatic field curves, and the distortion curve of the second embodiment of the present invention. An imaging optical lens assembly in accordance with the second embodiment of the present invention comprises an aperture stop 200 and an optical assembly. The optical assembly comprises, in order from an object side to an image side: a first lens element 210, a second lens element 220, a third lens element 230, a fourth lens element 240, a fifth lens element 250, an IR cut filter 260 and an image plane 270, wherein the imaging optical lens assembly has a total of five lens elements with refractive power. The aperture stop 200 is located between an object to be photographed and an image-side surface 212 of the first lens element 210.

The first lens element 210 with a positive refractive power has an object-side surface 211 being convex near an optical axis 290 and the image-side surface 212 being concave near the optical axis 290, both the object-side and image-side surfaces 211, 212 are aspheric, and the first lens element 210 is made of plastic material.

The second lens element 220 with a negative refractive power has an object-side surface 221 being concave near the optical axis 290 and an image-side surface 222 being concave near the optical axis 290, both the object-side and image-side surfaces 221, 222 are aspheric, and the second lens element 220 is made of plastic material.

The third lens element 230 with a positive refractive power has an object-side surface 231 being convex near the optical axis 290 and an image-side surface 232 being convex near the optical axis 290, both the object-side and image-side surfaces 231, 232 are aspheric, and the third lens element 230 is made of plastic material.

The fourth lens element 240 with a positive refractive power has an object-side surface 241 being concave near the optical axis 290 and an image-side surface 242 being convex near the optical axis 290, both the object-side and image-side surfaces 241, 242 are aspheric, and the fourth lens element 240 is made of plastic material.

The fifth lens element 250 with a negative refractive power has an object-side surface 251 being concave near the optical axis 290 and an image-side surface 252 being convex near the optical axis 290, both the object-side and image-side surfaces 251, 252 are aspheric, the fifth lens element 250 is made of plastic material, and more than two inflection points are formed on the image-side surface 252 of the fifth lens element 250.

The IR cut filter 260 made of glass is located between the fifth lens element 250 and the image plane 270 and has no influence on the focal length of the imaging optical lens assembly.

The detailed optical data of the second embodiment is shown in Table 3 and the aspheric surface data is shown in Table 4 below.

TABLE 3 (Embodiment 2) Focal Surface Curvature Radius Thickness Material index Abbe # length 0 Object Plane Infinity 1 Aperture Plane −0.25 stop 2 Lens 1 1.4343(ASP) 0.67 Plastic 1.535 55.7 2.7827 3 29.3526(ASP) 0.071 4 Lens 2 −176.6591(ASP) 0.28 Plastic 1.633 23.6 −4.4094 5 2.8740(ASP) 0.29 6 Lens 3 11.3285(ASP) 0.69 Plastic 1.546 55.9 15.2967 7 −31.5121(ASP) 0.35 8 Lens 4 −3.8123(ASP) 0.63 Plastic 1.535 55.7 2.2646 9 −0.9759(ASP) 0.47 10 Lens 5 −0.7644(ASP) 0.42 Plastic 1.535 55.7 −1.8728 11 −3.7445(ASP) 0.06 12 IR-filter Plane 0.21 Glass 1.517 64.0 13 Plane 0.55 14 Image Plane 0 f(focal length) = 3.93 mm, Fno = 2.4, HFOV = 35.6 deg.

TABLE 4 Aspheric Coefficients Surface # 2 3 4 5 6 k= −0.2781 −90.0000 90.0000 −36.9939 90.0000 A4= 9.3864E−03 −1.3223E−01 −1.9177E−01 7.6366E−02 −1.8603E−01 A6= 4.5911E−02 3.5435E−01 6.1262E−01 2.0456E−01 −5.0914E−02 A8= −1.0249E−01 −4.7456E−01 −6.9690E−01 −2.7900E−01 5.6585E−01 A10= 1.2582E−01 4.0675E−01 1.7332E−01 4.0583E−01 −1.6984E+00 A12= −3.7221E−02 −6.1274E−01 −6.7780E−02 −5.6925E−01 2.1361E+00 A14= −3.9071E−02 3.6571E−01 1.2566E−01 3.9783E−01 −1.1369E+00 A16= 0 0 0 0 0 A18= 0 0 0 0 0 A20= 0 0 0 0 0 Surface # 7 8 9 10 11 k= 90.0000 6.4514 −0.7895 −2.4312 −62.7242 A4= −2.3007E−01 −3.2838E−01 −6.0208E−03 2.4179E−01 1.8092E−01 A6= 9.7175E−02 1.7620E−02 7.0032E−02 −1.1302E−01 −1.5412E−01 A8= −1.2593E−01 1.8668E−01 −6.3554E−02 −9.1803E−02 5.5985E−02 A10= −5.3490E−02 −2.5315E−01 2.6913E−02 9.6426E−02 −9.1657E−03 A12= 1.2105E−01 −1.3555E−01 2.8565E−03 −5.4315E−03 −2.9531E−05 A14= −5.2614E−02 3.7465E−01 −3.4819E−04 −2.7605E−02 1.7189E−04 A16= 0 −0.1509472 −0.00135118 1.2647E−02 −8.3176E−06 A18= 0 0 0 −0.0017381 −8.77E−07 A20= 0 0 0 0 0

In the 2nd embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 2nd embodiment, so an explanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 3 and Table 4 as the following values and satisfy the following conditions:

Embodiment 2 Fno 2.4 R9/R10 0.20 FOV 71.2 f1/f2 −0.63 Y_inf2/Y_inf1 1.89 | SAG_42 |/CT4 1.61 R10/f −0.95 | f3 | > | f2 | > f1 Yes T23/T45 0.62 (R4 + R5)/(R4 − R5) −1.68 V3-V2 32.30 TTL/ImgH 1.65

FIG. 3A shows an imaging optical lens assembly in accordance with a third embodiment of the present invention, and FIG. 3B shows, in order from left to right, the longitudinal spherical aberration curves, the astigmatic field curves, and the distortion curve of the third embodiment of the present invention. An imaging optical lens assembly in accordance with the third embodiment of the present invention comprises an aperture stop 300 and an optical assembly. The optical assembly comprises, in order from an object side to an image side: a first lens element 310, a second lens element 320, a third lens element 330, a fourth lens element 340, a fifth lens element 350, an IR cut filter 360 and an image plane 370, wherein the imaging optical lens assembly has a total of five lens elements with refractive power. The aperture stop 300 is located between an object to be photographed and an image-side surface 312 of the first lens element 310.

The first lens element 310 with a positive refractive power has an object-side surface 311 being convex near an optical axis 390 and the image-side surface 312 being convex near the optical axis 390, both the object-side and image-side surfaces 311, 312 are aspheric, and the first lens element 310 is made of plastic material.

The second lens element 320 with a negative refractive power has an object-side surface 321 being concave near the optical axis 390 and an image-side surface 322 being concave near the optical axis 390, both the object-side and image-side surfaces 321, 322 are aspheric, and the second lens element 320 is made of plastic material.

The third lens element 330 with a positive refractive power has an object-side surface 331 being convex near the optical axis 390 and an image-side surface 332 being convex near the optical axis 390, both the object-side and image-side surfaces 331, 332 are aspheric, and the third lens element 330 is made of plastic material.

The fourth lens element 340 with a positive refractive power has an object-side surface 341 being concave near the optical axis 390 and an image-side surface 342 being convex near the optical axis 390, both the object-side and image-side surfaces 341, 342 are aspheric, and the fourth lens element 340 is made of plastic material.

The fifth lens element 350 with a negative refractive power has an object-side surface 351 being concave near the optical axis 390 and an image-side surface 352 being convex near the optical axis 390, both the object-side and image-side surfaces 351, 352 are aspheric, the fifth lens element 350 is made of plastic material, and more than two inflection points are formed on the image-side surface 352 of the fifth lens element 350.

The IR cut filter 360 made of glass is located between the fifth lens element 350 and the image plane 370 and has no influence on the focal length of the imaging optical lens assembly.

The detailed optical data of the third embodiment is shown in Table 5 and the aspheric surface data is shown in Table 6 below.

TABLE 5 (Embodiment 3) Focal Surface Curvature Radius Thickness Material index Abbe # length 0 Object Plane Infinity 1 Aperture Plane −0.22 stop 2 Lens 1 1.4315(ASP) 0.60 Plastic 1.535 55.7 2.6228 3 −83.0(ASP) 0.064 4 Lens 2 −90.4559(ASP) 0.28 Plastic 1.633 23.6 −4.2400 5 2.8053(ASP) 0.31 6 Lens 3 17.7731(ASP) 0.57 Plastic 1.546 55.9 14.9445 7 −15.0100(ASP) 0.38 8 Lens 4 −4.5653(ASP) 0.63 Plastic 1.535 55.7 2.3330 9 −1.0309(ASP) 0.48 10 Lens 5 −0.7454(ASP) 0.39 Plastic 1.535 55.7 −1.8227 11 −3.6842(ASP) 0.03 12 IR-filter Plane 0.21 Glass 1.517 64.0 13 Plane 0.55 14 Image Plane 0 f(focal length) = 3.75 mm, Fno = 2.4, HFOV = 36.9 deg.

TABLE 6 Aspheric Coefficients Surface # 2 3 4 5 6 k= −0.3280 −90.0000 −90.0000 −32.8281 53.8672 A4= 8.5883E−03 −1.3100E−01 −1.6735E−01 9.6320E−02 −1.9504E−01 A6= 3.4333E−02 3.5267E−01 5.9447E−01 1.9077E−01 −5.5339E−02 A8= −1.0549E−01 −5.1086E−01 −7.0972E−01 −2.9297E−01 5.5110E−01 A10= 1.2967E−01 3.7702E−01 1.7541E−01 4.3679E−01 −1.7145E+00 A12= −4.4567E−02 −5.9014E−01 −5.3138E−02 −5.1811E−01 2.1230E+00 A14= −7.9496E−02 4.2539E−01 2.0241E−01 3.4103E−01 −1.0688E+00 A16= 0 0 0 0 0 A18= 0 0 0 0 0 A20= 0 0 0 0 0 Surface # 7 8 9 10 11 k= 90.0000 7.3757 −0.7855 −2.3256 −70.2737 A4= −2.3510E−01 −2.9279E−01 −1.1952E−02 2.3054E−01 1.7814E−01 A6= 9.1639E−02 2.5148E−04 7.9152E−02 −1.0936E−01 −1.5313E−01 A8= −1.2535E−01 1.9735E−01 −6.5321E−02 −9.1183E−02 5.5820E−02 A10= −4.7561E−02 −2.4001E−01 2.6542E−02 9.6591E−02 −9.1764E−03 A12= 1.2667E−01 −1.3266E−01 2.9777E−03 −5.3271E−03 −1.5584E−05 A14= −5.6852E−02 3.7085E−01 −3.7787E−04 −2.7586E−02 1.7165E−04 A16= 0 −0.1555624 −0.0014629 1.2629E−02 −9.0634E−06 A18= 0 0 0 −0.0017454 −8.30E−07 A20= 0 0 0 0 0

In the 3rd embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 3rd embodiment, so an explanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 5 and Table 6 as the following values and satisfy the following conditions:

Embodiment 3 Fno 2.4 R9/R10 0.20 FOV 73.9 f1/f2 −0.62 Y_inf2/Y_inf1 1.87 | SAG_42 |/CT4 1.46 R10/f −0.98 | f3 | > | f2 | > f1 Yes T23/T45 0.64 (R4 + R5)/(R4 − R5) −1.37 V3-V2 32.30 TTL/ImgH 1.57

FIG. 4A shows an imaging optical lens assembly in accordance with a fourth embodiment of the present invention, and FIG. 4B shows, in order from left to right, the longitudinal spherical aberration curves, the astigmatic field curves, and the distortion curve of the fourth embodiment of the present invention. An imaging optical lens assembly in accordance with the fourth embodiment of the present invention comprises an aperture stop 400 and an optical assembly. The optical assembly comprises, in order from an object side to an image side: a first lens element 410, a second lens element 420, a third lens element 430, a fourth lens element 440, a fifth lens element 450, an IR cut filter 460 and an image plane 470, wherein the imaging optical lens assembly has a total of five lens elements with refractive power. The aperture stop 400 is located between an object to be photographed and an image-side surface 412 of the first lens element 410.

The first lens element 410 with a positive refractive power has an object-side surface 411 being convex near an optical axis 490 and the image-side surface 412 being concave near the optical axis 490, both the object-side and image-side surfaces 411, 412 are aspheric, and the first lens element 410 is made of plastic material.

The second lens element 420 with a negative refractive power has an object-side surface 421 being convex near the optical axis 490 and an image-side surface 422 being concave near the optical axis 490, both the object-side and image-side surfaces 421, 422 are aspheric, and the second lens element 420 is made of plastic material.

The third lens element 430 with a positive refractive power has an object-side surface 431 being convex near the optical axis 490 and an image-side surface 432 being concave near the optical axis 490, both the object-side and image-side surfaces 431, 432 are aspheric, and the third lens element 430 is made of plastic material.

The fourth lens element 440 with a positive refractive power has an object-side surface 441 being concave near the optical axis 490 and an image-side surface 442 being convex near the optical axis 490, both the object-side and image-side surfaces 441, 442 are aspheric, and the fourth lens element 440 is made of plastic material.

The fifth lens element 450 with a negative refractive power has an object-side surface 451 being concave near the optical axis 490 and an image-side surface 452 being convex near the optical axis 490, both the object-side and image-side surfaces 451, 452 are aspheric, the fifth lens element 450 is made of plastic material, and more than two inflection points are formed on the image-side surface 452 of the fifth lens element 450.

The IR cut filter 460 made of glass is located between the fifth lens element 450 and the image plane 470 and has no influence on the focal length of the imaging optical lens assembly.

The detailed optical data of the fourth embodiment is shown in Table 7 and the aspheric surface data is shown in Table 8 below.

TABLE 7 (Embodiment 4) Focal Surface Curvature Radius Thickness Material index Abbe # length 0 Object Plane Infinity 1 Aperture Plane −0.23 stop 2 Lens 1 1.4992(ASP) 0.69 Plastic 1.535 55.7 2.8286 3 91.1(ASP) 0.075 4 Lens 2 123.8510(ASP) 0.28 Plastic 1.633 23.6 −4.5541 5 2.8493(ASP) 0.32 6 Lens 3 11.8807(ASP) 0.66 Plastic 1.546 55.9 26.0730 7 69.2000(ASP) 0.29 8 Lens 4 −4.1930(ASP) 0.63 Plastic 1.535 55.7 2.3357 9 −1.0169(ASP) 0.57 10 Lens 5 −0.7972(ASP) 0.41 Plastic 1.535 55.7 −1.9732 11 −3.7093(ASP) 0.03 12 IR-filter Plane 0.21 Glass 1.517 64.0 13 Plane 0.55 14 Image Plane 0 f(focal length) = 3.88 mm, Fno = 2.4, HFOV = 36.0 deg.

TABLE 8 Aspheric Coefficients Surface # 2 3 4 5 6 k= −0.3066 90.0000 90.0000 −33.1344 74.8523 A4= 1.0298E−02 −1.3420E−01 −1.9968E−01 4.9917E−02 −1.9561E−01 A6= 2.7183E−02 3.3719E−01 5.7905E−01 2.2606E−01 −1.6595E−02 A8= −7.3680E−02 −5.1890E−01 −6.8988E−01 −3.0544E−01 4.7649E−01 A10= 1.1444E−01 4.2809E−01 2.1672E−01 3.9363E−01 −1.5966E+00 A12= −8.5728E−02 −5.0190E−01 −9.3103E−02 −4.9766E−01 2.1784E+00 A14= 1.1503E−03 3.0339E−01 1.6031E−01 3.1962E−01 −1.2415E+00 A16= 0 0 0 0 0 A18= 0 0 0 0 0 A20= 0 0 0 0 0 Surface # 7 8 9 10 11 k= 48.8605 1.7617 −0.7724 −2.9078 −78.7189 A4= −2.3586E−01 −2.7921E−01 1.2392E−02 1.8158E−01 1.7306E−01 A6= 8.0510E−02 −5.6977E−03 4.7964E−02 −8.7894E−02 −1.4989E−01 A8= −1.0498E−01 1.5998E−01 −6.9595E−02 −9.6652E−02 5.4948E−02 A10= −6.7808E−02 −2.6109E−01 2.9970E−02 9.6997E−02 −9.1447E−03 A12= 1.0642E−01 −1.3474E−01 4.7587E−03 −4.9322E−03 9.0552E−06 A14= −3.9756E−02 3.8008E−01 −1.3518E−05 −2.7864E−02 1.7057E−04 A16= 0 −0.1422248 −0.00145846 1.2519E−02 −1.0577E−05 A18= 0 0 0 −0.0016823 −5.88E−07 A20= 0 0 0 0 0

In the 4th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 4th embodiment, so an explanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 7 and Table 8 as the following values and satisfy the following conditions:

Embodiment 4 Fno 2.4 R9/R10 0.21 FOV 72.0 f1/f2 −0.62 Y_inf2/Y_inf1 1.89 | SAG_42 |/CT4 1.48 R10/f −0.96 | f3 | > | f2 | > f1 Yes T23/T45 0.56 (R4 + R5)/(R4 − R5) −1.63 V3-V2 32.30 TTL/ImgH 1.65

FIG. 5A shows an imaging optical lens assembly in accordance with a fifth embodiment of the present invention, and FIG. 5B shows, in order from left to right, the longitudinal spherical aberration curves, the astigmatic field curves, and the distortion curve of the fifth embodiment of the present invention. An imaging optical lens assembly in accordance with the fifth embodiment of the present invention comprises an aperture stop 500 and an optical assembly. The optical assembly comprises, in order from an object side to an image side: a first lens element 510, a second lens element 520, a third lens element 530, a fourth lens element 540, a fifth lens element 550, an IR cut filter 560 and an image plane 570, wherein the imaging optical lens assembly has a total of five lens elements with refractive power. The aperture stop 500 is located between an object to be photographed and an image-side surface 512 of the first lens element 510.

The first lens element 510 with a positive refractive power has an object-side surface 511 being convex near an optical axis 590 and the image-side surface 512 being concave near the optical axis 590, both the object-side and image-side surfaces 511, 512 are aspheric, and the first lens element 510 is made of plastic material.

The second lens element 520 with a negative refractive power has an object-side surface 521 being concave near the optical axis 590 and an image-side surface 522 being concave near the optical axis 590, both the object-side and image-side surfaces 521, 522 are aspheric, and the second lens element 520 is made of plastic material.

The third lens element 530 with a positive refractive power has an object-side surface 531 being convex near the optical axis 590 and an image-side surface 532 being concave near the optical axis 590, both the object-side and image-side surfaces 531, 532 are aspheric, and the third lens element 530 is made of plastic material.

The fourth lens element 540 with a positive refractive power has an object-side surface 541 being concave near the optical axis 590 and an image-side surface 542 being convex near the optical axis 590, both the object-side and image-side surfaces 541, 542 are aspheric, and the fourth lens element 540 is made of plastic material.

The fifth lens element 550 with a negative refractive power has an object-side surface 551 being concave near the optical axis 590 and an image-side surface 552 being convex near the optical axis 590, both the object-side and image-side surfaces 551, 552 are aspheric, the fifth lens element 550 is made of plastic material, and more than two inflection points are formed on the image-side surface 552 of the fifth lens element 550.

The IR cut filter 560 made of glass is located between the fifth lens element 550 and the image plane 570 and has no influence on the focal length of the imaging optical lens assembly.

The detailed optical data of the fifth embodiment is shown in Table 9 and the aspheric surface data is shown in Table 10 below.

TABLE 9 (Embodiment 5) Focal Surface Curvature Radius Thickness Material index Abbe # length 0 Object Plane Infinity 1 Aperture Plane −0.18 stop 2 Lens 1 1.3431(ASP) 0.51 Plastic 1.535 55.7 2.5801 3 37.1(ASP) 0.065 4 Lens 2 −21.4947(ASP) 0.28 Plastic 1.633 23.6 −4.2528 5 3.1377(ASP) 0.21 6 Lens 3 5.1662(ASP) 0.39 Plastic 1.535 55.7 12.0482 7 24.8864(ASP) 0.42 8 Lens 4 −6.1519(ASP) 0.68 Plastic 1.546 55.9 1.8614 9 −0.9092(ASP) 0.40 10 Lens 5 −0.6065(ASP) 0.28 Plastic 1.535 55.7 −1.4808 11 −2.9680(ASP) 0.03 12 IR-filter Plane 0.21 Glass 1.517 64.0 13 Plane 0.55 14 Image Plane 0 f(focal length) = 3.33 mm, Fno = 2.4, HFOV = 40.2 deg.

TABLE 10 Aspheric Coefficients Surface # 2 3 4 5 6 k= −0.3221 −38.7637 −44.4437 −54.1382 −90.0000 A4= 1.0457E−02 −1.1844E−01 −1.1362E−01 1.2371E−01 −1.9432E−01 A6= 1.5103E−02 3.0807E−01 5.4008E−01 1.6679E−01 4.7648E−03 A8= −8.6607E−02 −6.8623E−01 −9.0229E−01 −3.2318E−01 3.1767E−01 A10= 1.1877E−01 1.7475E−01 1.0742E−01 4.8461E−01 −1.5328E+00 A12= −1.4852E−01 −5.8345E−01 8.5155E−02 −4.0608E−01 2.3172E+00 A14= −2.1514E−01 1.0141E+00 7.2991E−01 3.2814E−01 −1.1325E+00 A16= 0 0 0 0 0 A18= 0 0 0 0 0 A20= 0 0 0 0 0 Surface # 7 8 9 10 11 k= 90.0000 17.1722 −0.9195 −1.9974 −90.0000 A4= −2.3280E−01 −2.8098E−01 −1.3284E−03 3.1175E−01 1.8638E−01 A6= 1.5003E−01 8.6070E−02 1.1439E−01 −1.5972E−01 −1.6682E−01 A8= −2.1176E−01 2.1992E−01 −5.9667E−02 −8.8656E−02 6.1792E−02 A10= −2.4079E−02 −2.5621E−01 2.1597E−02 1.0295E−01 −1.0605E−02 A12= 1.8928E−01 −1.4822E−01 7.5569E−04 −5.0785E−03 1.1111E−04 A14= −4.5146E−02 3.6853E−01 −5.3271E−04 −2.8295E−02 1.9228E−04 A16= 0 −0.1503961 −0.0008901 1.2446E−02 −1.6506E−05 A18= 0 0 0 −0.0016435 −2.69E−07 A20= 0 0 0 0 0

In the 5th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 5th embodiment, so an explanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 9 and Table 10 as the following values and satisfy the following conditions:

Embodiment 5 Fno 2.4 R9/R10 0.20 FOV 80.4 f1/f2 −0.61 Y_inf2/Y_inf1 1.85 | SAG_42 |/CT4 1.10 R10/f −0.89 | f3 | > | f2 | > f1 Yes T23/T45 0.52 (R4 + R5)/(R4 − R5) −4.09 V3-V2 32.10 TTL/ImgH 1.41

FIG. 6A shows an imaging optical lens assembly in accordance with a sixth embodiment of the present invention, and FIG. 6B shows, in order from left to right, the longitudinal spherical aberration curves, the astigmatic field curves, and the distortion curve of the sixth embodiment of the present invention. An imaging optical lens assembly in accordance with the sixth embodiment of the present invention comprises an aperture stop 600 and an optical assembly. The optical assembly comprises, in order from an object side to an image side: a first lens element 610, a second lens element 620, a third lens element 630, a fourth lens element 640, a fifth lens element 650, an IR cut filter 660 and an image plane 670, wherein the imaging optical lens assembly has a total of five lens elements with refractive power. The aperture stop 600 is located between an object to be photographed and an image-side surface 612 of the first lens element 610.

The first lens element 610 with a positive refractive power has an object-side surface 611 being convex near an optical axis 690 and the image-side surface 612 being convex near the optical axis 690, both the object-side and image-side surfaces 611, 612 are aspheric, and the first lens element 610 is made of plastic material.

The second lens element 620 with a negative refractive power has an object-side surface 621 being concave near the optical axis 690 and an image-side surface 622 being concave near the optical axis 690, both the object-side and image-side surfaces 621, 622 are aspheric, and the second lens element 620 is made of plastic material.

The third lens element 630 with a negative refractive power has an object-side surface 631 being convex near the optical axis 690 and an image-side surface 632 being concave near the optical axis 690, both the object-side and image-side surfaces 631, 632 are aspheric, and the third lens element 630 is made of plastic material.

The fourth lens element 640 with a positive refractive power has an object-side surface 641 being convex near the optical axis 690 and an image-side surface 642 being convex near the optical axis 690, both the object-side and image-side surfaces 641, 642 are aspheric, and the fourth lens element 640 is made of plastic material.

The fifth lens element 650 with a negative refractive power has an object-side surface 651 being concave near the optical axis 690 and an image-side surface 652 being convex near the optical axis 690, both the object-side and image-side surfaces 651, 652 are aspheric, the fifth lens element 650 is made of plastic material, and more than two inflection points are formed on the image-side surface 652 of the fifth lens element 650.

The IR cut filter 660 made of glass is located between the fifth lens element 650 and the image plane 670 and has no influence on the focal length of the imaging optical lens assembly.

The detailed optical data of the sixth embodiment is shown in Table 11 and the aspheric surface data is shown in Table 12 below.

TABLE 11 (Embodiment 6) Focal Surface Curvature Radius Thickness Material index Abbe # length 0 Object Plane Infinity 1 Aperture Plane −0.21 stop 2 Lens 1 1.3562(ASP) 0.59 Plastic 1.535 55.7 2.4636 3 −47.3(ASP) 0.050 4 Lens 2 −24.4635(ASP) 0.28 Plastic 1.633 23.6 −4.9081 5 3.6264(ASP) 0.36 6 Lens 3 44.0098(ASP) 0.52 Plastic 1.535 55.7 −8.3333 7 4.0480(ASP) 0.14 8 Lens 4 28.9234(ASP) 0.69 Plastic 1.546 55.9 1.8203 9 −1.0265(ASP) 0.49 10 Lens 5 −0.6748(ASP) 0.35 Plastic 1.535 55.7 −1.7158 11 −2.9770(ASP) 0.03 12 IR-filter Plane 0.21 Glass 1.517 64.0 13 Plane 0.55 14 Image Plane 0 f(focal length) = 3.61 mm, Fno = 2.4, HFOV = 38.0 deg.

TABLE 12 Aspheric Coefficients Surface # 2 3 4 5 6 k= −0.3555 −14.8375 −90.0000 −52.0570 −90.0000 A4= 9.1146E−03 −1.4924E−01 −1.1097E−01 1.4532E−01 −2.0808E−01 A6= 1.5461E−02 3.6213E−01 5.3538E−01 1.8980E−01 1.9306E−04 A8= −1.0361E−01 −6.8128E−01 −8.1138E−01 −3.2362E−01 5.5597E−01 A10= 1.3774E−01 3.7271E−01 2.2851E−01 4.6096E−01 −1.6815E+00 A12= −6.6555E−02 −3.6998E−01 1.2113E−01 −4.2552E−01 2.0370E+00 A14= −1.8446E−01 3.3632E−01 1.7943E−01 3.3740E−01 −9.6979E−01 A16= 0 0 0 0 0 A18= 0 0 0 0 0 A20= 0 0 0 0 0 Surface # 7 8 9 10 11 k= −18.0351 −90.0000 −1.1982 −2.6474 −90.0000 A4 −3.2989E−01 −3.1054E−01 2.8048E−02 2.2712E−01 1.8000E−01 A6= 2.6752E−01 1.8595E−01 6.8082E−02 −1.2136E−01 −1.5774E−01 A8= −2.4148E−01 4.1048E−02 −3.9907E−02 −9.2164E−02 5.7332E−02 A10= −8.9289E−02 −2.1419E−01 1.6485E−02 9.9142E−02 −9.3981E−03 A12= 2.0000E−01 −1.2045E−01 −3.2508E−03 −4.2835E−03 −1.8258E−05 A14= −7.3872E−02 3.5268E−01 −1.0810E−03 −2.7591E−02 1.8200E−04 A16= 0 −0.1567234 −3.34E−07 1.2462E−02 −9.0598E−06 A18= 0 0 0 −0.0017458 −1.13E−06 A20= 0 0 0 0 0

In the 6th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 6th embodiment, so an explanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 11 and Table 12 as the following values and satisfy the following conditions:

Embodiment 6 Fno 2.4 R9/R10 0.23 FOV 76.0 f1/f2 −0.50 Y_inf2/Y_inf1 1.90 | SAG_42 |/CT4 1.05 R10/f −0.82 | f3 | > | f2 | > f1 Yes T23/T45 0.73 (R4 + R5)/(R4 − R5) −1.18 V3-V2 32.10 TTL/ImgH 1.50

FIG. 7A shows an imaging optical lens assembly in accordance with a seventh embodiment of the present invention, and FIG. 7B shows, in order from left to right, the longitudinal spherical aberration curves, the astigmatic field curves, and the distortion curve of the seventh embodiment of the present invention. An imaging optical lens assembly in accordance with the seventh embodiment of the present invention comprises an aperture stop 700 and an optical assembly. The optical assembly comprises, in order from an object side to an image side: a first lens element 710, a second lens element 720, a third lens element 730, a fourth lens element 740, a fifth lens element 750, an IR cut filter 760 and an image plane 770, wherein the imaging optical lens assembly has a total of five lens elements with refractive power. The aperture stop 700 is located between an object to be photographed and an image-side surface 712 of the first lens element 710.

The first lens element 710 with a negative refractive power has an object-side surface 711 being convex near an optical axis 790 and the image-side surface 712 being concave near the optical axis 790, both the object-side and image-side surfaces 711, 712 are aspheric, and the first lens element 710 is made of plastic material.

The second lens element 720 with a positive refractive power has an object-side surface 721 being convex near the optical axis 790 and an image-side surface 722 being convex near the optical axis 790, both the object-side and image-side surfaces 721, 722 are aspheric, and the second lens element 720 is made of plastic material.

The third lens element 730 with a negative refractive power has an object-side surface 731 being concave near the optical axis 790 and an image-side surface 732 being concave near the optical axis 790, both the object-side and image-side surfaces 731, 732 are aspheric, and the third lens element 730 is made of plastic material.

The fourth lens element 740 with a positive refractive power has an object-side surface 741 being convex near the optical axis 790 and an image-side surface 742 being convex near the optical axis 790, both the object-side and image-side surfaces 741, 742 are aspheric, and the fourth lens element 740 is made of plastic material.

The fifth lens element 750 with a positive refractive power has an object-side surface 751 being concave near the optical axis 790 and an image-side surface 752 being convex near the optical axis 790, both the object-side and image-side surfaces 751, 752 are aspheric, the fifth lens element 750 is made of plastic material, and more than two inflection points are formed on the image-side surface 752 of the fifth lens element 750.

The IR cut filter 760 made of glass is located between the fifth lens element 750 and the image plane 770 and has no influence on the focal length of the imaging optical lens assembly.

The detailed optical data of the seventh embodiment is shown in Table 13 and the aspheric surface data is shown in Table 14 below.

TABLE 13 (Embodiment 7) Focal Surface Curvature Radius Thickness Material index Abbe # length 0 Object Plane Infinity 1 Aperture Plane −0.19 stop 2 Lens 1 1.3872(ASP) 0.54 Plastic 1.535 55.7 2.5664 3 −209.2(ASP) 0.058 4 Lens 2 −29.1595(ASP) 0.28 Plastic 1.633 23.6 −4.8832 5 3.5195(ASP) 0.35 6 Lens 3 33.2592(ASP) 0.40 Plastic 1.535 55.7 −71.4285 7 17.7454(ASP) 0.28 8 Lens 4 −8.6362(ASP) 0.61 Plastic 1.546 55.9 2.0306 9 −1.0102(ASP) 0.52 10 Lens 5 −0.6693(ASP) 0.35 Plastic 1.535 55.7 −1.6978 11 −2.9681(ASP) 0.03 12 IR-filter Plane 0.21 Glass 1.517 64.0 13 Plane 0.55 14 Image Plane 0 f(focal length) = 3.51 mm, Fno = 2.4, HFOV = 38.7 deg.

TABLE 14 Aspheric Coefficients Surface # 2 3 4 5 6 k= −0.3854      90.0000     −90.0000      −53.8658       −90.0000      A4=  7.8691E−03 −1.5510E−01 −1.1959E−01  1.4793E−01 −2.6010E−01 A6=  7.8592E−03  3.3408E−01  5.3056E−01  1.7356E−01 −1.7819E−02 A8= −9.5284E−02 −6.6114E−01 −8.3353E−01 −3.4179E−01  4.8002E−01 A10=  1.2678E−01  3.5715E−01  2.4159E−01  4.7108E−01 −1.7276E+00 A12= −1.0862E−01 −4.1946E−01  1.7326E−01 −4.1408E−01  2.0446E+00 A14= −1.9231E−01  4.3025E−01  2.0354E−01  3.1318E−01 −1.0479E+00 A16= 0         0         0         0         0         A18= 0         0         0         0         0         A20= 0         0         0         0         0         Surface # 7 8 9 10 11 k= 90.0000     20.7061     −0.9731      −2.5717     −90.0000       A4= −3.4480E−01 −2.8723E−01  1.1542E−02  2.2349E−01  1.8100E−01 A6=  2.0061E−01  1.4089E−01  8.2707E−02 −1.1883E−01 −1.5883E−01 A8= −2.5068E−01  9.1077E−02 −3.8320E−02 −9.2357E−02  5.7644E−02 A10= −6.8263E−02 −2.0715E−01  1.8771E−02  9.9028E−02 −9.4113E−03 A12=  1.9900E−01 −1.2229E−01 −2.6539E−03 −4.3061E−03 −3.1704E−05 A14= −9.3125E−02  3.5555E−01 −1.3107E−03 −2.7598E−02  1.8270E−04 A16= 0         −0.1550772   −0.00045058  1.2460E−02 −8.2099E−06 A18= 0         0         0        −0.001742   −1.28E−06   A20= 0         0         0        0        0

In the 7th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 7th embodiment, so an explanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 13 and Table 14 as the following values and satisfy the following conditions:

Embodiment 7 Fno 2.4 R9/R10 0.23 FOV 77.4 f1/f2 −0.53 Y_inf2/Y_inf1 1.88 | SAG_42 |/CT4 1.17 R10/f −0.85 | f3 | > | f2 | > f1 Yes T23/T45 0.67 (R4 + R5)/(R4 − R5) −1.24 V3-V2 32.10 TTL/ImgH 1.44

FIG. 8A shows an imaging optical lens assembly in accordance with a eighth embodiment of the present invention, and FIG. 8B shows, in order from left to right, the longitudinal spherical aberration curves, the astigmatic field curves, and the distortion curve of the eighth embodiment of the present invention. An imaging optical lens assembly in accordance with the eighth embodiment of the present invention comprises an aperture stop 800 and an optical assembly. The optical assembly comprises, in order from an object side to an image side: a first lens element 810, a second lens element 820, a third lens element 830, a fourth lens element 840, a fifth lens element 850, an IR cut filter 860 and an image plane 870, wherein the imaging optical lens assembly has a total of five lens elements with refractive power. The aperture stop 800 is located between an object to be photographed and an image-side surface 812 of the first lens element 810.

The first lens element 810 with a positive refractive power has an object-side surface 811 being convex near an optical axis 890 and the image-side surface 812 being concave near the optical axis 890, both the object-side and image-side surfaces 811, 812 are aspheric, and the first lens element 810 is made of plastic material.

The second lens element 820 with a negative refractive power has an object-side surface 821 being convex near the optical axis 890 and an image-side surface 822 being concave near the optical axis 890, both the object-side and image-side surfaces 821, 822 are aspheric, and the second lens element 820 is made of plastic material.

The third lens element 830 with a positive refractive power has an object-side surface 831 being convex near the optical axis 890 and an image-side surface 832 being concave near the optical axis 890, both the object-side and image-side surfaces 831, 832 are aspheric, and the third lens element 830 is made of plastic material.

The fourth lens element 840 with a positive refractive power has an object-side surface 841 being convex near the optical axis 890 and an image-side surface 842 being convex near the optical axis 890, both the object-side and image-side surfaces 841, 842 are aspheric, and the fourth lens element 840 is made of plastic material.

The fifth lens element 850 with a negative refractive power has an object-side surface 851 being concave near the optical axis 890 and an image-side surface 852 being convex near the optical axis 890, both the object-side and image-side surfaces 851, 852 are aspheric, the fifth lens element 850 is made of plastic material, and more than two inflection points are formed on the image-side surface 852 of the fifth lens element 850.

The IR cut filter 860 made of glass is located between the fifth lens element 850 and the image plane 870 and has no influence on the focal length of the imaging optical lens assembly.

The detailed optical data of the eighth embodiment is shown in Table 15 and the aspheric surface data is shown in Table 16 below.

TABLE 15 (Embodiment 8) Focal Surface Curvature Radius Thickness Material index Abbe # length 0 Object Plane Infinity 1 Aperture Plane −0.21 stop 2 Lens 1 1.4280(ASP) 0.50 Plastic 1.535 55.7 3.1467 3 8.1(ASP) 0.130 4 Lens 2 22.0009(ASP) 0.28 Plastic 1.633 23.6 −5.1839 5 2.8724(ASP) 0.23 6 Lens 3 6.0884(ASP) 0.65 Plastic 1.535 55.7 12.4730 7 63.8977(ASP) 0.35 8 Lens 4 230.3037(ASP) 0.73 Plastic 1.546 55.9 1.7358 9 −0.9539(ASP) 0.38 10 Lens 5 −0.5410(ASP) 0.43 Plastic 1.535 55.7 −1.5373 11 −1.9645(ASP) 0.10 12 IR-filter Plane 0.21 Glass 1.517 64.0 13 Plane 0.48 14 Image Plane 0 f(focal length) = 3.56 mm, Fno = 2.4, HFOV = 38.4 deg.

TABLE 16 Aspheric Coefficients Surface # 2 3 4 5 6 k= −0.6578      89.8228      16.1643     −34.6510       29.3660     A4=  3.4524E−02 −1.3497E−01 −2.0120E−01  1.1854E−02 −2.0762E−01 A6=  1.2926E−02  2.5492E−01  4.7034E−01  2.8866E−01  4.5025E−02 A8= −3.0806E−02 −6.9803E−01 −6.7234E−01 −3.7545E−01  2.6059E−01 A10=  1.0897E−01  6.5039E−01  2.9515E−01  4.0131E−01 −1.1118E+00 A12= −1.3582E−01 −1.8459E−01  9.5841E−03 −3.3330E−01  1.5880E+00 A14= −4.9099E−02 −3.8896E−01 −3.3782E−02  2.0610E−01 −9.4841E−01 A16= 0         0         0         0         0         A18= 0         0         0         0         0         A20= 0         0         0         0         0         Surface # 7 8 9 10 11 k= 90.0000     89.8223     −0.9702      −1.8531      −23.1035       A4= −2.2209E−01 −2.9862E−01 −1.1164E−02  3.2119E−01  2.2841E−01 A6=  6.6131E−02 −5.4218E−02  7.0349E−02 −1.3691E−01 −1.7178E−01 A8= −6.6752E−02  1.8980E−01 −5.8148E−02 −9.7937E−02  5.9291E−02 A10= −1.2553E−01 −1.7956E−01  1.0637E−02  1.0251E−01 −9.8722E−03 A12=  1.8342E−01 −1.8929E−01  3.1064E−03 −5.3705E−03  2.2058E−04 A14= −7.9074E−02  3.2590E−01  2.1374E−03 −2.8438E−02  1.6236E−04 A16= 0         −0.1048182  −0.00074056   1.2359E−02 −2.1011E−05 A18= 0         0        0         −0.0015646  8.03E−07  A20= 0         0        0         0 0

In the 8th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 8th embodiment, so an explanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 15 and Table 16 as the following values and satisfy the following conditions:

Embodiment 8 Fno 2.4 R9/R10 0.28 FOV 76.8 f1/f2 −0.61 Y_inf2/Y_inf1 1.83 | SAG_42 |/CT4 1.17 R10/f −0.55 | f3 | > | f2 | > f1 Yes T23/T45 0.60 (R4 + R5)/(R4 − R5) −2.79 V3-V2 32.10 TTL/ImgH 1.57

FIG. 9A shows an imaging optical lens assembly in accordance with a ninth embodiment of the present invention, and FIG. 9B shows, in order from left to right, the longitudinal spherical aberration curves, the astigmatic field curves, and the distortion curve of the ninth embodiment of the present invention. An imaging optical lens assembly in accordance with the ninth embodiment of the present invention comprises an aperture stop 900 and an optical assembly. The optical assembly comprises, in order from an object side to an image side: a first lens element 910, a second lens element 920, a third lens element 930, a fourth lens element 940, a fifth lens element 950, an IR cut filter 960 and an image plane 970, wherein the imaging optical lens assembly has a total of five lens elements with refractive power. The aperture stop 900 is located between an object to be photographed and an image-side surface 912 of the first lens element 910.

The first lens element 910 with a positive refractive power has an object-side surface 911 being convex near an optical axis 990 and the image-side surface 912 being convex near the optical axis 990, both the object-side and image-side surfaces 911, 912 are aspheric, and the first lens element 910 is made of plastic material.

The second lens element 920 with a negative refractive power has an object-side surface 921 being convex near the optical axis 990 and an image-side surface 922 being concave near the optical axis 990, both the object-side and image-side surfaces 921, 922 are aspheric, and the second lens element 920 is made of plastic material.

The third lens element 930 with a negative refractive power has an object-side surface 931 being convex near the optical axis 990 and an image-side surface 932 being concave near the optical axis 990, both the object-side and image-side surfaces 931, 932 are aspheric, and the third lens element 930 is made of plastic material.

The fourth lens element 940 with a positive refractive power has an object-side surface 941 being concave near the optical axis 990 and an image-side surface 942 being convex near the optical axis 990, both the object-side and image-side surfaces 941, 942 are aspheric, and the fourth lens element 940 is made of plastic material.

The fifth lens element 950 with a negative refractive power has an object-side surface 951 being concave near the optical axis 990 and an image-side surface 952 being convex near the optical axis 990, both the object-side and image-side surfaces 951, 952 are aspheric, the fifth lens element 950 is made of plastic material, and more than two inflection points are formed on the image-side surface 952 of the fifth lens element 950.

The IR cut filter 960 made of glass is located between the fifth lens element 950 and the image plane 970 and has no influence on the focal length of the imaging optical lens assembly.

The detailed optical data of the ninth embodiment is shown in Table 17 and the aspheric surface data is shown in Table 18 below.

TABLE 17 (Embodiment 9) Focal Surface Curvature Radius Thickness Material index Abbe # length 0 Object Plane Infinity 1 Aperture Plane −0.21 stop 2 Lens 1 1.4315(ASP) 0.58 Plastic 1.546 55.9 2.4801 3 −25.3(ASP) 0.054 4 Lens 2 627.5304(ASP) 0.28 Plastic 1.633 23.6 −4.4753 5 2.8550(ASP) 0.29 6 Lens 3 28.0499(ASP) 0.51 Plastic 1.535 55.7 −37.5439 7 11.6605(ASP) 0.28 8 Lens 4 −160.5762(ASP) 0.80 Plastic 1.546 55.9 1.6264 9 −0.8882(ASP) 0.36 10 Lens 5 −0.5329(ASP) 0.52 Plastic 1.535 55.7 −1.5219 11 −2.0546(ASP) 0.10 12 IR-filter Plane 0.21 Glass 1.517 64.0 13 Plane 0.48 14 Image Plane 0 f(focal length) = 3.71 mm, Fno = 2.4, HFOV = 37.3 deg.

TABLE 18 Aspheric Coefficients Surface # 2 3 4 5 6 k= −1.4415      89.3106     −60.4687      −30.3422       9.1767     A4=  5.3388E−02 −9.6995E−02 −7.5591E−02  1.4130E−01 −2.1085E−01 A6=  2.2079E−03  2.9141E−01  4.8287E−01  1.7293E−01  6.3474E−02 A8= −7.7735E−02 −7.0966E−01 −8.2692E−01 −3.0292E−01  3.5860E−01 A10=  1.1800E−01  5.1953E−01  3.6707E−01  5.5859E−01 −1.2266E+00 A12= −1.3257E−01 −2.3461E−01  2.3838E−01 −4.1110E−01  1.9221E+00 A14= −7.4837E−02  7.1108E−02 −1.3079E−01  1.2075E−01 −1.0273E+00 A16= 0         0         0         0         0         A18= 0         0         0         0         0         A20= 0         0         0         0         0         Surface # 7 8 9 10 11 k= 28.3800      −22.1704       −1.8455      −1.9447      −24.7049       A4= −3.3692E−01 −3.6658E−01 −9.5911E−02  3.3131E−01  2.0942E−01 A6=  3.4358E−01  1.2553E−01  1.3019E−01 −1.3053E−01 −1.5419E−01 A8= −3.4619E−01  1.4909E−01 −4.8214E−02 −9.9629E−02  5.2541E−02 A10= −1.5420E−02 −1.8644E−01  1.7376E−03  1.0010E−01 −8.6682E−03 A12=  3.6960E−01 −1.9568E−01 −6.7394E−03 −7.3570E−03  1.7809E−04 A14= −1.8486E−01  3.4502E−01 −5.1912E−04 −2.5310E−02  1.4879E−04 A16= 0         −0.1230725     0.001561608  1.1422E−02 −1.9617E−05 A18= 0         0         0         −0.0015049   7.89E−07   A20= 0         0         0         0         0        

In the 9th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 9th embodiment, so an explanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 17 and Table 18 as the following values and satisfy the following conditions:

Embodiment 9 Fno 2.4 R9/R10 0.26 FOV 74.6 f1/f2 −0.55 Y_inf2/Y_inf1 1.81 | SAG_42 |/CT4 1.17 R10/f −0.55 | f3 | > | f2 | > f1 Yes T23/T45 0.83 (R4 + R5)/(R4 − R5) −1.23 V3-V2 32.10 TTL/ImgH 1.57

FIG. 10A shows an imaging optical lens assembly in accordance with a tenth embodiment of the present invention, and FIG. 10B shows, in order from left to right, the longitudinal spherical aberration curves, the astigmatic field curves, and the distortion curve of the tenth embodiment of the present invention. An imaging optical lens assembly in accordance with the tenth embodiment of the present invention comprises an aperture stop 1000 and an optical assembly. The optical assembly comprises, in order from an object side to an image side: a first lens element 1010, a second lens element 1020, a third lens element 1030, a fourth lens element 1040, a fifth lens element 1050, an IR cut filter 1060 and an image plane 1070, wherein the imaging optical lens assembly has a total of five lens elements with refractive power. The aperture stop 1000 is located between an object to be photographed and an image-side surface 1012 of the first lens element 1010.

The first lens element 1010 with a positive refractive power has an object-side surface 1011 being convex near an optical axis 1090 and the image-side surface 1012 being concave near the optical axis 1090, both the object-side and image-side surfaces 1011, 1012 are aspheric, and the first lens element 1010 is made of plastic material.

The second lens element 1020 with a negative refractive power has an object-side surface 1021 being convex near the optical axis 1090 and an image-side surface 1022 being concave near the optical axis 1090, both the object-side and image-side surfaces 1021, 1022 are aspheric, and the second lens element 1020 is made of plastic material.

The third lens element 1030 with a positive refractive power has an object-side surface 1031 being convex near the optical axis 1090 and an image-side surface 1032 being convex near the optical axis 1090, both the object-side and image-side surfaces 1031, 1032 are aspheric, and the third lens element 1030 is made of plastic material.

The fourth lens element 1040 with a positive refractive power has an object-side surface 1041 being concave near the optical axis 1090 and an image-side surface 1042 being convex near the optical axis 1090, both the object-side and image-side surfaces 1041, 1042 are aspheric, and the fourth lens element 1040 is made of plastic material.

The fifth lens element 1050 with a negative refractive power has an object-side surface 1051 being concave near the optical axis 1090 and an image-side surface 1052 being convex near the optical axis 1090, both the object-side and image-side surfaces 1051, 1052 are aspheric, the fifth lens element 1050 is made of plastic material, and more than two inflection points are formed on the image-side surface 1052 of the fifth lens element 1050.

The IR cut filter 1060 made of glass is located between the fifth lens element 1050 and the image plane 1070 and has no influence on the focal length of the imaging optical lens assembly.

The detailed optical data of the tenth embodiment is shown in Table 19 and the aspheric surface data is shown in Table 20 below.

TABLE 19 (Embodiment 10) Focal Surface Curvature Radius Thickness Material index Abbe # length 0 Object Plane Infinity 1 Aperture Plane −0.21 stop 2 Lens 1 1.4475(ASP) 0.48 Plastic 1.546 55.9 3.2320 3 7.0(ASP) 0.137 4 Lens 2 16.9199(ASP) 0.28 Plastic 1.633 23.6 −4.7855 5 2.5799(ASP) 0.18 6 Lens 3 8.5806(ASP) 0.42 Plastic 1.546 55.9 6.4524 7 −5.9082(ASP) 0.46 8 Lens 4 −4.7184(ASP) 0.76 Plastic 1.546 55.9 1.6274 9 −0.7928(ASP) 0.38 10 Lens 5 −0.5002(ASP) 0.59 Plastic 1.535 55.7 −1.4871 11 −1.8828(ASP) 0.10 12 IR-filter Plane 0.21 Glass 1.517 64.0 13 Plane 0.48 14 Image Plane 0 f(focal length) = 3.56 mm, Fno = 2.4, HFOV = 38.6 deg.

TABLE 20 Aspheric Coefficients Surface # 2 3 4 5 6 k= 0.0464     36.4037     −64.2821       −31.4320       4.6332     A4=  1.3690E−02 −5.5337E−02 −1.8439E−01  1.9262E−02 −2.3439E−01 A6=  3.2708E−02  1.9968E−01  4.0673E−01  1.1964E−01  1.2647E−01 A8= −1.0823E−02 −4.3491E−01 −6.9615E−01 −2.0469E−01  8.9268E−02 A10=  1.1180E−01  5.4294E−01  4.4013E−01  4.5770E−01 −8.7845E−01 A12= −1.6780E−01 −3.2304E−01 −2.3518E−01 −7.7414E−01  2.1237E+00 A14=  1.0229E−01 −4.3017E−01 −4.3963E−01  3.6947E−01 −1.5074E+00 A16= 0         0         0         0         0         A18= 0         0         0         0         0         A20= 0         0         0         0         0         Surface # 7 8 9 10 11 k= −90.0000       0.9863     −2.6785      −2.5528     −26.0468       A4= −2.3636E−01 −2.3214E−01 −1.6086E−01  2.3856E−01  2.2070E−01 A6=  1.3871E−01  1.4357E−01  1.6605E−01 −7.5314E−02 −1.6735E−01 A8= −1.1833E−01  2.4713E−02 −1.6808E−02 −1.2250E−01  5.8151E−02 A10= −9.5347E−02  5.1261E−02 −2.8890E−02  1.0596E−01 −9.6868E−03 A12=  2.9499E−01 −3.4915E−01 −5.3810E−03 −3.4300E−03  2.3421E−04 A14= −1.0410E−01  3.3304E−01  6.7406E−03 −2.8679E−02  1.5798E−04 A16= 0         −0.1027709   −0.00086287  1.2149E−02 −2.1537E−05 A18= 0         0        0        −0.0015369   9.07E−07  A20= 0         0        0        0         0    

In the 10th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 10th embodiment, so an explanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 19 and Table 20 as the following values and satisfy the following conditions:

Embodiment 10 Fno 2.4 R9/R10 0.27 FOV 77.1 f1/f2 −0.68 Y_inf2/Y_inf1 1.84 | SAG_42 |/CT4 1.14 R10/f −0.53 | f3 | > | f2 | > f1 Yes T23/T45 0.47 (R4 + R5)/(R4 − R5) −1.86 V3-V2 32.30 TTL/ImgH 1.57

FIG. 11A shows an imaging optical lens assembly in accordance with a eleventh embodiment of the present invention, and FIG. 11B shows, in order from left to right, the longitudinal spherical aberration curves, the astigmatic field curves, and the distortion curve of the eleventh embodiment of the present invention. An imaging optical lens assembly in accordance with the eleventh embodiment of the present invention comprises an aperture stop 1100 and an optical assembly. The optical assembly comprises, in order from an object side to an image side: a first lens element 1110, a second lens element 1120, a third lens element 1130, a fourth lens element 1140, a fifth lens element 1150, an IR cut filter 1160 and an image plane 1170, wherein the imaging optical lens assembly has a total of five lens elements with refractive power. The aperture stop 1100 is located between an object to be photographed and an image-side surface 1112 of the first lens element 1110.

The first lens element 1110 with a negative refractive power has an object-side surface 1111 being convex near an optical axis 1190 and the image-side surface 1112 being concave near the optical axis 1190, both the object-side and image-side surfaces 1111, 1112 are aspheric, and the first lens element 1110 is made of plastic material.

The second lens element 1120 with a positive refractive power has an object-side surface 1121 being concave near the optical axis 1190 and an image-side surface 1122 being convex near the optical axis 1190, both the object-side and image-side surfaces 1121, 1122 are aspheric, and the second lens element 1120 is made of plastic material.

The third lens element 1130 with a negative refractive power has an object-side surface 1131 being convex near the optical axis 1190 and an image-side surface 1132 being concave near the optical axis 1190, both the object-side and image-side surfaces 1131, 1132 are aspheric, and the third lens element 1130 is made of plastic material.

The fourth lens element 1140 with a positive refractive power has an object-side surface 1141 being convex near the optical axis 1190 and an image-side surface 1142 being concave near the optical axis 1190, both the object-side and image-side surfaces 1141, 1142 are aspheric, and the fourth lens element 1140 is made of plastic material.

The fifth lens element 1150 with a positive refractive power has an object-side surface 1151 being concave near the optical axis 1190 and an image-side surface 1152 being convex near the optical axis 1190, both the object-side and image-side surfaces 1151, 1152 are aspheric, the fifth lens element 1150 is made of plastic material, and more than two inflection points are formed on the image-side surface 1152 of the fifth lens element 1150.

The IR cut filter 1160 made of glass is located between the fifth lens element 1150 and the image plane 1170 and has no influence on the focal length of the imaging optical lens assembly.

The detailed optical data of the eleventh embodiment is shown in Table 21 and the aspheric surface data is shown in Table 22 below.

TABLE 21 (Embodiment 11) Focal Surface Curvature Radius Thickness Material index Abbe # length 0 Object Plane Infinity 1 Aperture Plane −0.15 stop 2 Lens 1 1.5243(ASP) 0.52 Plastic 1.546 55.9 2.1530 3 −4.6(ASP) 0.033 4 Lens 2 −3.0806(ASP) 0.28 Plastic 1.584 30.1 −4.7620 5 28.9911(ASP) 0.24 6 Lens 3 −47.8724(ASP) 0.28 Plastic 1.633 23.6 −6.5474 7 4.6105(ASP) 0.17 8 Lens 4 −4.8489(ASP) 1.00 Plastic 1.546 55.9 1.5762 9 −0.7867(ASP) 0.58 10 Lens 5 −0.5814(ASP) 0.58 Plastic 1.546 55.9 −1.7963 11 −1.9108(ASP) 0.10 12 IR-filter Plane 0.21 Glass 1.517 64.0 13 Plane 0.48 14 Image Plane 0 f(focal length) = 3.37 mm, Fno = 2.4, HFOV = 40.1 deg.

TABLE 22 Aspheric Coefficients Surface # 2 3 4 5 6 k= −2.4549     −90.0000       −37.7122       90.0000     90.0000     A4=  7.6413E−02 −3.5832E−02  2.0860E−02 −9.0358E−02 −6.7089E−01 A6= −3.4373E−02  2.0348E−01  3.4524E−01  9.8685E−02  2.2219E−01 A8= −5.5263E−02 −6.5808E−01 −7.7541E−01 −3.9379E−01 −6.3976E−02 A10=  7.0400E−02  5.9056E−01  6.1952E−01  4.3136E−01 −1.3495E+00 A12= −3.6315E−01 −2.4534E−01  4.1722E−01 −5.4791E−01  2.2596E+00 A14=  1.6045E−01  1.1568E−01 −4.0215E−01  1.2179E−01 −9.1512E−01 A16= 0         0         0         0         0         A18= 0         0         0         0         0         A20= 0         0         0         0         0         Surface # 7 8 9 10 11 k= −40.6081       9.5874    −2.5706      −3.4503     −31.4395       A4= −4.9191E−01 −2.0214E−01 −1.8374E−01  1.3685E−01  1.9479E−01 A6=  6.5081E−01  2.5223E−01  1.4802E−01 −2.5310E−03 −1.4606E−01 A8= −2.9957E−01  4.3955E−01 −6.0734E−02 −1.5178E−01  5.1308E−02 A10= −1.6327E−01 −4.2259E−01  3.3157E−02  1.0973E−01 −8.9341E−03 A12=  1.1289E−01 −1.3780E+00 −9.3996E−03 −3.1688E−03  2.7709E−04 A14=  8.0987E−02  2.2143E+00 −1.0810E−02 −2.8247E−02  1.4795E−04 A16= 0         −0.9823062     0.002598355  1.1931E−02 −2.2012E−05 A18= 0         0         0         −0.001513    9.97E−07  A20= 0         0         0         0         0    

In the 11th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 11th embodiment, so an explanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 21 and Table 22 as the following values and satisfy the following conditions:

Embodiment 11 Fno 2.4 R9/R10 0.30 FOV 80.1 f1/f2 −0.45 Y_inf2/Y_inf1 1.82 | SAG_42 |/CT4 0.89 R10/f −0.57 | f3 | > | f2 | > f1 Yes T23/T45 0.42 (R4 + R5)/(R4 − R5) −0.25 V3-V2 −6.50 TTL/ImgH 1.57

FIG. 12A shows an imaging optical lens assembly in accordance with a twelfth embodiment of the present invention, and FIG. 12B shows, in order from left to right, the longitudinal spherical aberration curves, the astigmatic field curves, and the distortion curve of the twelfth embodiment of the present invention. An imaging optical lens assembly in accordance with the twelfth embodiment of the present invention comprises an aperture stop 1200 and an optical assembly. The optical assembly comprises, in order from an object side to an image side: a first lens element 1210, a second lens element 1220, a third lens element 1230, a fourth lens element 1240, a fifth lens element 1250, an IR cut filter 1260 and an image plane 1270, wherein the imaging optical lens assembly has a total of five lens elements with refractive power. The aperture stop 1200 is located between an image-side surface 1212 of the first lens element 1210 and an image-side surface 1222 of the second lens element 1220.

The first lens element 1210 with a positive refractive power has an object-side surface 1211 being convex near an optical axis 1290 and the image-side surface 1212 being convex near the optical axis 1290, both the object-side and image-side surfaces 1211, 1212 are aspheric, and the first lens element 1210 is made of plastic material.

The second lens element 1220 with a negative refractive power has an object-side surface 1221 being concave near the optical axis 1290 and the image-side surface 1222 being concave near the optical axis 1290, both the object-side and image-side surfaces 1221, 1222 are aspheric, and the second lens element 1220 is made of plastic material.

The third lens element 1230 with a positive refractive power has an object-side surface 1231 being convex near the optical axis 1290 and an image-side surface 1232 being concave near the optical axis 1290, both the object-side and image-side surfaces 1231, 1232 are aspheric, and the third lens element 1230 is made of plastic material.

The fourth lens element 1240 with a positive refractive power has an object-side surface 1241 being concave near the optical axis 1290 and an image-side surface 1242 being convex near the optical axis 1290, both the object-side and image-side surfaces 1241, 1242 are aspheric, and the fourth lens element 1240 is made of plastic material.

The fifth lens element 1250 with a negative refractive power has an object-side surface 1251 being concave near the optical axis 1290 and an image-side surface 1252 being convex near the optical axis 1290, both the object-side and image-side surfaces 1251, 1252 are aspheric, the fifth lens element 1250 is made of plastic material, and more than two inflection points are formed on the image-side surface 1252 of the fifth lens element 1250.

The IR cut filter 1260 made of glass is located between the fifth lens element 1250 and the image plane 1270 and has no influence on the focal length of the imaging optical lens assembly.

The detailed optical data of the twelfth embodiment is shown in Table 23 and the aspheric surface data is shown in Table 24 below.

TABLE 23 (Embodiment 12) Focal Surface Curvature Radius Thickness Material index Abbe # length 0 Object Plane Infinity 1 Lens 1 1.6401(ASP) 0.55 2 −35.629(ASP) 0.03 Plastic 1.546 55.9 2.8845 3 Aperture Plane 0.06 stop 4 Lens 2 −47.842(ASP) 0.28 Plastic 1.636 23.1 −4.5906 5 3.1210(ASP) 0.27 6 Lens 3 3.3384(ASP) 0.45 Plastic 1.535 55.7 23.8285 7 4.3072(ASP) 0.32 8 Lens 4 −27.152(ASP) 0.81 Plastic 1.546 55.9 1.3540 9 −0.7278(ASP) 0.34 10 Lens 5 −0.4769(ASP) 0.57 Plastic 1.546 54.1 −1.3627 11 −1.9448(ASP) 0.10 12 IR-filter Plane 0.21 Glass 1.517 64.0 13 Plane 0.48 14 Image Plane 0 f(focal length) = 3.44 mm, Fno = 2.4, HFOV = 39.6 deg.

TABLE 24 Aspheric Coefficients Surface # 1 2 4 5 6 k= −0.6165      90.0000     90.0000     −47.6438       −1.8561     A4= −1.4414E−02 −9.6846E−02 −1.1363E−01  8.3384E−02 −2.1751E−01 A6=  5.4816E−02  1.8244E−01  5.7878E−01  2.2192E−01  1.1480E−01 A8= −1.9483E−01 −3.1304E−01 −8.1469E−01 −2.8323E−01  1.6916E−01 A10=  1.5898E−01  4.5849E−01  4.5853E−01  3.4566E−01 −1.0714E+00 A12= −5.3064E−03 −7.8492E−01  5.2621E−02 −6.3865E−01  1.8846E+00 A14= −8.7490E−02  4.8504E−01 −2.7679E−01  4.5738E−01 −1.1905E+00 A16= 0         0         0 0 0 A18= 0         0         0 0 0 A20= 0         0         0 0 0 Surface # 7 8 9 10 11 k= −90.0000       48.9486     −2.5011      −2.3516      −25.7608       A4= −1.0930E−01 −2.8715E−01 −1.9193E−01  2.2174E−01  2.1816E−01 A6=  1.0613E−01  1.9191E−01  1.2596E−01 −5.2778E−02 −1.6563E−01 A8= −1.3917E−01  1.7456E−02  3.7589E−03 −1.3032E−01  5.8133E−02 A10= −8.3873E−02  6.8875E−02 −1.1891E−02  1.0453E−01 −9.9848E−03 A12=  2.8331E−01 −3.3319E−01 −1.4734E−03 −2.9528E−03  2.9689E−04 A14= −1.5900E−01  3.2988E−01  6.1074E−03 −2.8155E−02  1.6216E−04 A16= 0         −0.106988    −0.00245945  1.2325E−02 −2.3202E−05 A18= 0         0          0         −0.0016481  9.78E−07  A20= 0         0          0         0         0        

In the 12th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 12th embodiment, so an explanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 23 and Table 24 as the following values and satisfy the following conditions:

Embodiment 12 Fno 2.4 R9/R10 0.25 FOV 79.2 f1/f2 −0.63 Y_inf2/Y_inf1 1.82 | SAG_42 |/CT4 1.00 R10/f −0.57 | f3 | > | f2 | > f1 Yes T23/T45 0.78 (R4 + R5)/(R4 − R5) −29.71 V3-V2 32.60 TTL/ImgH 1.57

FIG. 13A shows an imaging optical lens assembly in accordance with a thirteenth embodiment of the present invention, and FIG. 13B shows, in order from left to right, the longitudinal spherical aberration curves, the astigmatic field curves, and the distortion curve of the thirteenth embodiment of the present invention. An imaging optical lens assembly in accordance with the thirteenth embodiment of the present invention comprises an aperture stop 1300 and an optical assembly. The optical assembly comprises, in order from an object side to an image side: a first lens element 1310, a second lens element 1320, a third lens element 1330, a fourth lens element 1340, a fifth lens element 1350, an IR cut filter 1360 and an image plane 1370, wherein the imaging optical lens assembly has a total of five lens elements with refractive power. The aperture stop 1300 is located between an image-side surface 1312 of the first lens element 1310 and an image-side surface 1322 of the second lens element 1320.

The first lens element 1310 with a positive refractive power has an object-side surface 1311 being convex near an optical axis 1390 and the image-side surface 1312 being concave near the optical axis 1390, both the object-side and image-side surfaces 1311, 1312 are aspheric, and the first lens element 1310 is made of plastic material.

The second lens element 1320 with a negative refractive power has an object-side surface 1321 being concave near the optical axis 1390 and the image-side surface 1322 being convex near the optical axis 1390, both the object-side and image-side surfaces 1321, 1322 are aspheric, and the second lens element 1320 is made of plastic material.

The third lens element 1330 with a positive refractive power has an object-side surface 1331 being convex near the optical axis 1390 and an image-side surface 1332 being convex near the optical axis 1390, both the object-side and image-side surfaces 1331, 1332 are aspheric, and the third lens element 1330 is made of plastic material.

The fourth lens element 1340 with a positive refractive power has an object-side surface 1341 being concave near the optical axis 1390 and an image-side surface 1342 being convex near the optical axis 1390, both the object-side and image-side surfaces 1341, 1342 are aspheric, and the fourth lens element 1340 is made of plastic material.

The fifth lens element 1350 with a negative refractive power has an object-side surface 1351 being concave near the optical axis 1390 and an image-side surface 1352 being convex near the optical axis 1390, both the object-side and image-side surfaces 1351, 1352 are aspheric, the fifth lens element 1350 is made of plastic material, and more than two inflection points are formed on the image-side surface 1352 of the fifth lens element 1350.

The IR cut filter 1360 made of glass is located between the fifth lens element 1350 and the image plane 1370 and has no influence on the focal length of the imaging optical lens assembly.

The detailed optical data of the thirteenth embodiment is shown in Table 25 and the aspheric surface data is shown in Table 26 below.

TABLE 25 (Embodiment 13) Focal Surface Curvature Radius Thickness Material index Abbe # length 0 Object Plane Infinity 1 Lens 1 1.6141(ASP) 0.55 2 26.828(ASP) 0.03 Plastic 1.546 55.9 3.1200 3 Aperture Plane 0.06 stop 4 Lens 2 −13.620(ASP) 0.28 Plastic 1.636 23.1 −4.5852 5 3.7469(ASP) 0.27 6 Lens 3 5.1895(ASP) 0.45 Plastic 1.546 55.9 8.8772 7 −71.8492(ASP) 0.32 8 Lens 4 −7.150(ASP) 0.81 Plastic 1.546 55.9 1.5262 9 −0.7743(ASP) 0.34 10 Lens 5 −0.5003(ASP) 0.57 Plastic 1.546 54.1 −1.4559 11 −1.9314(ASP) 0.10 12 IR-filter Plane 0.21 Glass 1.517 64.0 13 Plane 0.48 14 Image Plane 0 f(focal length) = 3.44 mm, Fno = 2.4, HFOV = 39.6 deg.

TABLE 26 Aspheric Coefficients Sur- face # 1 2 4 5 6 k= −2.6531      90.0000      −15.1111       −45.5620       3.5090    A4=  6.0507E−02  1.5480E−02  2.6914E−02  6.2577E−02 −2.5264E−01 A6=  8.4636E−02 −2.6055E−02  2.0517E−01  1.5997E−01  8.4056E−02 A8= −2.0649E−01 −1.1139E−01 −8.5221E−01 −3.0787E−01  1.5506E−01 A10=  1.1473E−01  2.8635E−01  9.0715E−01  3.8492E−01 −8.8071E−01 A12=  1.7757E−01 −6.4866E−01 −9.0868E−03 −4.0310E−01  2.0604E+00 A14= −2.4333E−01  3.0810E−01 −9.3002E−01  1.0825E−01 −1.4359E+00 A16= 0         0 0 0 0 A18= 0         0 0 0 0 A20= 0         0 0 0 0 Sur- face # 7 8 9 10 11 k= 90.0000     27.2105      −2.7206      −2.4435      −24.8979       A4= −2.3692E−01 −2.8544E−01 −2.1950E−01  2.4295E−01  2.2514E−01 A6=  9.5866E−02  2.1625E−01  1.9485E−01 −6.6618E−02 −1.7313E−01 A8= −1.4597E−01 −5.7434E−02  5.2592E−03 −1.2856E−01  6.1283E−02 A10= −9.3694E−02  4.8404E−02 −3.5863E−02  1.0734E−01 −1.0441E−02 A12=  3.2265E−01 −3.0221E−01 −1.0361E−02 −3.2487E−03  2.7366E−04 A14= −1.4035E−01  3.5589E−01  6.8276E−03 −2.8730E−02  1.6841E−04 A16= 0         −0.134884    −0.00018381  1.2110E−02 −2.2530E−05 A18= 0         0         0         −0.0015284   8.85E−07  A20= 0         0         0         0         0        

In the 13th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 13th embodiment, so an explanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 25 and Table 26 as the following values and satisfy the following conditions:

Embodiment 13 Fno 2.4 R9/R10 0.26 FOV 79.3 f1/f2 −0.68 Y_inf2/Y_inf1 1.82 | SAG_42 |/CT4 1.14 R10/f −0.56 | f3 | > | f2 | > f1 Yes T23/T45 0.38 (R4 + R5)/(R4 − R5) −6.19 V3-V2 32.80 TTL/ImgH 1.57

In the present imaging optical lens assembly, the lens elements can be made of plastic or glass. If the lens elements are made of plastic, the cost will be effectively reduced. If the lens elements are made of glass, there is more freedom in distributing the refractive power of the imaging optical lens assembly. Plastic lens elements can have aspheric surfaces, which allow more design parameter freedom (than spherical surfaces), so as to reduce the aberration and the number of the lens elements, as well as the total track length of the imaging optical lens assembly.

In the present imaging optical lens assembly, if the object-side or the image-side surface of the lens elements with refractive power is convex and the location of the convex surface is not defined, the object-side or the image-side surface of the lens elements near the optical axis is convex. If the object-side or the image-side surface of the lens elements is concave and the location of the concave surface is not defined, the object-side or the image-side surface of the lens elements near the optical axis is concave.

The imaging optical lens assembly of the present invention can be used in focusing optical systems and can obtain better image quality. The imaging optical lens assembly of the present invention can also be used in electronic imaging systems, such as, 3D image capturing, digital camera, mobile device, digital flat panel or vehicle camera.

The embodiments depicted above and the appended drawings are exemplary and are not intended to be exhaustive or to limit the scope of the present disclosure to the precise forms disclosed. Many modifications and variations are possible in view of the above teachings.

While we have shown and described various embodiments in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention. 

What is claimed is:
 1. An imaging optical lens assembly comprising an aperture stop and an optical assembly, the optical assembly comprising: in order from an object side to an image side: a first lens element with a positive refractive power having an aspheric object-side surface and an aspheric image-side surface; a second lens element with a refractive power having an aspheric object-side surface and an aspheric image-side surface, the second lens element being made of plastic material; a third lens element with a refractive power having an aspheric object-side surface and an aspheric image-side surface, the third lens element being made of plastic material; a fourth lens element with a refractive power having an aspheric object-side surface and an aspheric image-side surface, the fourth lens element being made of plastic material; a fifth lens element with a negative refractive power having an aspheric object-side surface and an aspheric image-side surface being convex near an optical axis, the fifth lens element being made of plastic material; wherein the image-side surface of the fifth lens element is formed with at least two inflection points, including a first inflection point and a second inflection point further away from the optical axis, a vertical distance from the first inflection point to the optical axis is Y_inf1, a vertical distance from the second inflection point to the optical axis is Y_inf2, and the following condition is satisfied: 1.7<Y_inf2/Y_inf1<2.1.
 2. The imaging optical lens assembly as claimed in claim 1, wherein a focal length of the imaging optical lens assembly is f, a radius of curvature of the image-side surface of the fifth lens element is R10, and the following condition is satisfied: −1.2<R10/f<−0.3.
 3. The imaging optical lens assembly as claimed in claim 1, wherein a distance along the optical axis between the second lens element and the third lens element is T23, a distance along the optical axis between the fourth lens element and the fifth lens element is T45, and the following condition is satisfied: 0.3<T23/T45<1.1.
 4. The imaging optical lens assembly as claimed in claim 3, wherein an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, and the following condition is satisfied: 20<V3−V2<42.
 5. The imaging optical lens assembly as claimed in claim 1, wherein the aperture stop is located between the second lens element and an object to be photographed.
 6. The imaging optical lens assembly as claimed in claim 5, wherein a radius of curvature of the object-side surface of the fifth lens element is R9, a radius of curvature of the image-side surface of the fifth lens element is R10, and the following condition is satisfied: 0.15<R9/R10<1.0.
 7. The imaging optical lens assembly as claimed in claim 5, wherein a focal length of the first lens element is f1, a focal length of the second lens element is f2, and the following condition is satisfied: −0.7<f1/f2<−0.3.
 8. The imaging optical lens assembly as claimed in claim 7, wherein a maximal field of view of the imaging optical lens assembly is FOV, and the following condition is satisfied: 70≦FOV<85.
 9. The imaging optical lens assembly as claimed in claim 5, wherein a distance in parallel with the optical axis from an axial vertex on the image-side surface of the fourth lens element to a maximum effective radius position on the image-side surface of the fourth lens element is SAG_(—)42, a central thickness of the fourth lens element is CT4, and the following condition is satisfied: 1.0≦|SAG _(—)42|/CT4<1.8.
 10. The imaging optical lens assembly as claimed in claim 5, wherein a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the third lens element is f3, and the following condition is satisfied: |f3|>|f2|>f1.
 11. The imaging optical lens assembly as claimed in claim 10, wherein a distance from the object-side surface of the first lens element to an image plane along the optical axis is TTL, half of the maximum diagonal imaging height of the imaging optical lens assembly is ImgH, and the following condition is satisfied: TTL/ImgH<1.7.
 12. An imaging optical lens assembly comprising an aperture stop and an optical assembly, the optical assembly comprising: in order from an object side to an image side: a first lens element with a positive refractive power having an aspheric object-side surface being convex near an optical axis and an aspheric image-side surface; a second lens element with a negative refractive power having an aspheric object-side surface and an aspheric image-side surface, the second lens element being made of plastic material; a third lens element with a refractive power having an aspheric object-side surface and an aspheric image-side surface, the third lens element being made of plastic material; a fourth lens element with a positive refractive power having an aspheric object-side surface and an aspheric image-side surface being convex near an optical axis, the fourth lens element being made of plastic material; a fifth lens element with a negative refractive power having an aspheric object-side surface being concave near an optical axis and an aspheric image-side surface being convex near an optical axis, the fifth lens element being made of plastic material; the aperture stop being located between the second lens element and an object to be photographed; wherein a focal length of the imaging optical lens assembly is f, a radius of curvature of the image-side surface of the fifth lens element is R10, a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the third lens element is f3, and the following conditions are satisfied: −1.2<R10/f<−0.3; |f3|>|f2|>f1.
 13. The imaging optical lens assembly as claimed in claim 12, wherein the image-side surface of the fifth lens element is formed with at least two inflection points.
 14. The imaging optical lens assembly as claimed in claim 13, wherein the image-side surface of the fifth lens element is formed with a first inflection point and a second inflection point further away from the optical axis, a vertical distance from the first inflection point to the optical axis is Y_inf1, a vertical distance from the second inflection point to the optical axis is Y_inf2, and the following condition is satisfied: 1.7<Y_inf2/Y_inf1<2.1.
 15. The imaging optical lens assembly as claimed in claim 12, wherein the focal length of the first lens element is f1, the focal length of the second lens element is f2, and the following condition is satisfied: −0.7<f1/f2<−0.3.
 16. The imaging optical lens assembly as claimed in claim 15, wherein a radius of curvature of the object-side surface of the fifth lens element is R9, the radius of curvature of the image-side surface of the fifth lens element is R10, and the following condition is satisfied: 0.15<R9/R10<1.0.
 17. The imaging optical lens assembly as claimed in claim 12, wherein a distance in parallel with the optical axis from an axial vertex on the image-side surface of the fourth lens element to a maximum effective radius position on the image-side surface of the fourth lens element is SAG_(—)42, a central thickness of the fourth lens element is CT4, and the following condition is satisfied: 1.0≦|SAG _(—)42|/CT4<1.8.
 18. The imaging optical lens assembly as claimed in claim 12, wherein an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, and the following condition is satisfied: 20<V3−V2<42.
 19. The imaging optical lens assembly as claimed in claim 18, wherein a radius of curvature of the image-side surface of the second lens element is R4, a radius of curvature of the object-side surface of the third lens element is R5, and the following condition is satisfied: −35.0<(R4+R5)/(R4−R5)<−0.9.
 20. The imaging optical lens assembly as claimed in claim 19, wherein a distance from the object-side surface of the first lens element to an image plane along the optical axis is TTL, half of the maximum diagonal imaging height of the imaging optical lens assembly is ImgH, and the following condition is satisfied: TTL/ImgH<1.7. 